Now that Adobe has released Flash Player 10 Beta with Speex support, I think it is technically feasible to support proper Jingle Audio chat in SparkWeb.
The point is that it would enable Web client to Desktop client audio chats.
Please discuss expectations, limitations (I guess Red5 support would be needed too), ideas etc.
Maybe it could be made into Google Summer of Code 2009 project, if nobody takes this project until then.
Since pretty much "everything" revolves around Web nowadays, XMPP/Jabber community might benefit tremendously from this project. Of course, having the software/technology is one thing, using it in creative & useful (and possibly money-making) ways is another.